Add the gitea k8s cluster to root's .kube/config file on bridge.
The default context does not exist in order to force us to explicitly
specify a context for all commands (so that we do not inadvertently
deploy something on the wrong k8s cluster).
Change-Id: I53368c76e6f5b3ab45b1982e9a977f9ce9f08581
7610682b6f